Merge PR #1035: release per-download status_queue proxy on close to fix fd leak (#485)

Wraps Download.close() in try/finally and nulls self.status_queue so the
per-download manager.Queue() proxy is released once the completed Download is
retained in the done list. Previously every finished download permanently
pinned one Manager-process connection, accumulating file descriptors until
the instance hit 'too many open files' and self-terminated (#485, #980).

Co-authored-by: Matt Van Horn <mvanhorn@users.noreply.github.com>

app/tests/test_download_queue.py

@@ -898,6 +898,40 @@ def _make_download(dq_env, *, download_type="video", status="downloading", filen
     )
 
 
+def test_download_close_releases_status_queue(dq_env):
+    download = _make_download(dq_env)
+    status_queue = MagicMock()
+    proc = MagicMock()
+    download.status_queue = status_queue
+    download.proc = proc
+
+    download.close()
+
+    proc.close.assert_called_once()
+    assert download.status_queue is None
+
+
+def test_download_close_releases_status_queue_without_process(dq_env):
+    download = _make_download(dq_env)
+    download.status_queue = MagicMock()
+
+    download.close()
+
+    assert download.status_queue is None
+
+
+def test_download_close_releases_status_queue_when_process_close_fails(dq_env):
+    download = _make_download(dq_env)
+    download.status_queue = MagicMock()
+    download.proc = MagicMock()
+    download.proc.close.side_effect = RuntimeError('close failed')
+
+    with pytest.raises(RuntimeError, match='close failed'):
+        download.close()
+
+    assert download.status_queue is None
+
+
 @pytest.mark.asyncio
 async def test_post_download_cleanup_clears_filename_on_error(dq_env):
     notifier = AsyncMock()

app/ytdl.py

@@ -787,8 +787,11 @@ class Download:
 
     def close(self):
         log.info(f"Closing download process for: {self.info.title}")
-        if self.started():
-            self.proc.close()
+        try:
+            if self.started():
+                self.proc.close()
+        finally:
+            self.status_queue = None
 
     def running(self):
         try: